CODESYS - the IEC 61131-3 automation software

Hello,

Has anyone ever written a program to convert PWM pulses to analog value?
If yes can you explain to me the principle.
I looked at OSCAT, but I did not find !

Thank you in advance
Best regard

You have a constant frequency usually, then you know the total time between first rising edge to second rising edge:

T = 1/f.

Period can also be calculated and averaged in software if frequency is not known.

Then you check the length of the on-pulse and then for example get the percentage on-time from total periode-time.

Or even easier, use a first or second order low-pass filter and get an analog voltage.

Thanks a lot somlioy , I'll try this soon.